[PD-dev] [ pure-data-Patches-1543850 ] $@ and $# expansion (argc, argv)
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Sat Jan 13 06:24:00 CET 2007
Patches item #1543850, was opened at 2006-08-21 06:24
Message generated for change (Comment added) made by matju
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Category: puredata
Group: wishlist
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: IOhannes m zmölnig (zmoelnig)
Assigned to: Miller Puckette (millerpuckette)
Summary: $@ and $# expansion (argc, argv)
Initial Comment:
the attached patch extends the $-expansion mechanism:
$# expands to the number of arguments; usable both as
A_DOLLAR (just "$#") and A_DOLLSYM ("$#-bla")
$@ expands to the entire list of arguments (e.g. [$@
$@( will expand [1 2 3( to [1 2 3 1 2 3(); this is only
usable as A_DOLLAR; i.e. [symbol $@-a( will always
expand to "$@-a"
why:
well, its a way to deal with dynamic length lists that
is still missing in pd (though 1st steps have been made
with [list])
caveats:
what is still missing is an expansion for the selector
of messages and objects (the selector of an object
would be the object's instantation name); would $$ be a
good name for this? (since $0 is already taken)
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Comment By: Mathieu Bouchard (matju)
Date: 2007-01-13 00:24
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i think that $@ is what is necessary to allow abstractions to do what they
want with args, and that $# is not so useful in comparison, and what would
be more useful than $# (in the sense of avoiding more detours) would be to
be able to do a $@-like thing that only starts at the Nth argument, e.g. if
I have an abstraction that takes $1 $2 $3 and then a variable number of
arguments, and those arguments starting with $4 are to be all written
directly in an objectbox. witness the strange stuff going on in
[nqpoly]...
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Comment By: IOhannes m zmölnig (zmoelnig)
Date: 2007-01-02 13:52
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updated for current CVSversion of pd (2007-01-02)
File Added: dollargcargv.patch
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Comment By: Hans-Christoph Steiner (eighthave)
Date: 2006-08-22 18:21
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Yes! This is great!
As for the selector, $0 is not taken in message space, so I
think it makes sense there. Since message expansion
variables are already different than object arguments, I
think that won't be too confusing. Plus the $ variable
syntax comes from shell scripting, where $0 is basically the
selector of the message that is the command line arguments.
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